Lost Communication With HVAC (Gateway Module)

LOST COMMUNICATION WITH HVAC (GATEWAY MODULE)





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously with the ignition in run.

- Set Condition:
The Gateway module does not receive any messages from the HVAC.





Diagnostic Test

1. ATTEMPT TO COMMUNICATE WITH THE HVAC
Turn the ignition on.
With the scan tool, select ECU View.
Verify that the HVAC is active on the bus.
Is the HVAC active on the bus?

Yes

- Go To2

No

- Perform the No Response diagnostic procedure. Communications - Verbose Codes

2. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC'S
With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTC's "Logged Against" the HVAC?

Yes

- Replace/update the HAVC.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace/update the module that set this DTC.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.